A kind of glass light guide plate and liquid crystal display module thereofTechnical field
The invention belongs to display device field, relate to a kind of light guide plate, be specifically related to a kind of glass light guide plate and the liquid crystal display module containing this glass light guide plate.
Background technology
Available liquid crystal module is as shown in Figure 1, generally it is made up of liquid-crystalline glasses 1 ', optical film combination 2 ', light guide plate 3 ', light source 4 ', reflector plate 5 ' and back cover 6 ', reflector plate 5 ' and light guide plate 3 ' are sequentially placed in the cavity of back cover 6 ', back cover 6 ' supports and partial appearance function as structure, this kind of structure complexity, causes that complete machine thickness is thicker, relatively costly, and backboard is generally metal or plastic parts, its color is single, is difficult to make different appearance.
Light guide plate 3 ' generally uses PMMA, its refractive index n=1.49, and air refraction n=1.When light is propagated in PMMA, according to Snell's law (Snell'sLaw), if the angle of light and PMMA normal is more than the angle of total reflection, light is propagated always in PMMA, without spilling, thus realizing light guide effect.Existing light guide plate 3 ' structure is generally as in figure 2 it is shown, it is positioned at the side of light source 4 ', overall in rectangular structure；Such as Fig. 2, definition, it is its incidence surface 31 ' one side corresponding with incidence surface 31 ' with light source 4 ' one side in opposite directions to be the one side that shady face 33 ' is adjacent with optical film combination 2 ' be exiting surface 32 ' and the one side adjacent with reflector plate 5 ' are bottom surface 34 ', and bottom surface 34 ' is formed some sites 35 '.In order to reach the ultrathin design of display module, conventional method is to reduce the thickness of light guide plate, and after the reduction of light guide plate, the LED thickness matched also to reduce, and existing ultra-thin LED brightness cannot meet the demand of large scale TV high brightness.Simultaneously PMMA thinning after, it is easily deformed, and causes into light uneven, it is easy to local light leak occur.
Summary of the invention
For the technical deficiency of above-mentioned existence, it is an object of the invention to provide a kind of glass light guide plate.
For solving above-mentioned technical problem, the present invention adopts the following technical scheme that a kind of glass light guide plate, and it contains:
Incidence surface；
Upper surface, described upper surface is used for light；
Bottom surface, described bottom surface is provided with multiple site；
Described incidence surface offers at least one groove.
Optimally, described incidence surface has between the upper and lower every arranging and symmetrical first area and each self-forming continuous print broached-tooth design of second area, described first area and the described groove on described second area.
Optimally, described incidence surface is a circular groove, and it is connected with described upper surface and described bottom surface respectively by miter；The plane of symmetry of described incidence surface is identical with the plane of symmetry of described glass light guide plate.
Further, it also includes the formation optical cement layer in described bottom surface and is arranged at the reflective coating bottom described optical cement layer.
Further, the refractive index of described optical cement layer is 1.2 ~ 1.5.
A further object of the present invention is in that to provide a kind of liquid crystal display module, and it includes above-mentioned glass light guide plate.
The beneficial effects of the present invention is: glass light guide plate of the present invention, by arranging specific micro structure at the incidence surface of light guide plate, it is possible to be effectively increased into light efficiency, reduce optical loss；Utilizing glass high intensity, high rigidity and high humiture reliability, collocation ultra-thin LED can meet large scale optical brightness requirement；Reflection and the complex reflex layer of outward appearance one can be done simultaneously at the light guide plate back side, utilize the rigidity of light guide plate to serve as structural support, it is possible to cancel the use of backboard, so reach the ultrathin design of complete machine.
Accompanying drawing explanation
Accompanying drawing 1 shows the structural representation of module for custom liquid crystals；
Accompanying drawing 2 is the structural representation of Conventional glass light guide plate；
Accompanying drawing 3 is the part-structure schematic diagram of glass light guide plate in the embodiment of the present invention 1；
Accompanying drawing 4 is the structural representation of glass light guide plate in the embodiment of the present invention 1；
Accompanying drawing 5 is the structural representation of liquid crystal display module in the embodiment of the present invention 2；
Accompanying drawing 6 is the structural representation of glass light guide plate in the embodiment of the present invention 3；
Wherein, 1 ', liquid-crystalline glasses；2 ', optical film combination；3 ', light guide plate；31 ', incidence surface；32 ', exiting surface；33 ', bottom surface；34 ', site；4 ', light source；5 ', reflector plate；6 ', back cover；1, liquid-crystalline glasses；2, optical film combination；3, light guide plate；31, incidence surface；32, upper surface；33, bottom surface；311, groove；312, first area；313, second area；34, site；4, light source；5, optical cement layer；6, reflective coating.
Detailed description of the invention
Below in conjunction with embodiment shown in the drawings, the present invention is described in detail below:
Embodiment 1
The present embodiment provides a kind of glass light guide plate 3, as it is shown on figure 3, it mainly includes incidence surface 31, upper surface 32 and bottom surface 33 (upper surface, the such position relationship in bottom surface are based in accompanying drawing 3 what the direction observed was defined).
Wherein, incidence surface 31 injecting for light sources such as LED；Upper surface 32 is used for light, and the light namely injected penetrates through this face；Bottom surface 33 is provided with multiple site 34, for making the light generation scattering being irradiated on this surface, so that this some light penetrates from upper surface 32, thus realizing backlight effect.
Existing light guide plate generally uses PMMA material, site 34 ' can be prepared by modes such as printing, injection, hot pressing, ink-jets, light conducting plate structure is generally cuboid, after incidence surface 31 ' polishing basic vertical with exiting surface 32 ', and light guide plate 3 ' separates with reflector plate 5 ', it is air layer (as shown in Figure 1) between light guide plate 3 ' and reflector plate 5 '.After light source 4 ' injects light guide plate 3 ', reflection and refraction can be there is at PMMA and Air Interface, occur the critical angle φ of total reflection to be about 41 °, when angle of incidence I > 41 °, being totally reflected at PMMA and Air Interface, light can be propagated forward in light guide plate internal reflection always；When angle of incidence I ' < 41 °, in PMMA and Air Interface, a part is launched, designed by the site 34 ' of bottom surface of light guide plate 33 ', when light is injected on site 34 ', light generation scattering, penetrate thus controlling some light from light guide plate exiting surface 32 ', thus realizing backlight effect.According to reflection law, when light is from air dielectric (refractive index n1=1) other materials (refractive index n is impinged perpendicularly on2) time, the reflectance R at interface is (1-n2)^2/(1+n2) refractive index of ^2, PMMA is 1.49, then R=4.2%.After the light arrival light guide plate incidence surface 31 ' that light source 4 ' penetrates, except refraction carries out the light of light guide plate, the light generation direct reflection also having 4.2% causes the loss into light.LED is point source, and its lighting angle is generally 120 °, and except LED impinges perpendicularly on the light of light guide plate and has the reflection loss of 4.2%, the light of other angle is injected into light guide plate incidence surface reflection loss all much larger than 4.2%, and angle is more big, and reflection loss is more serious.
At the present embodiment, incidence surface 31 place arranges specific micro structure, as offered multiple groove 311, when glass light guide plate 3 horizontal positioned, multiple grooves 31 are also horizontally disposed with and are parallel to each other, specifically as shown in Figure 3, incidence surface 31 is divided into upper and lower and spaced first area 312 and second area 313, first area 312 and second area 313 are offered continuous print multiple groove 311 respectively and forms broached-tooth design so that the plane of symmetry of first area 312 and second area 313 overlaps with the plane of symmetry of whole glass light guide plate or incidence surface 31.All become vertical incidence when so arriving serrated surface from the light of the different angles of LED light source outgoing, so can reduce the reflection loss because angle increase causes, be added to light efficiency.The shape of sawtooth (groove 311) difference according to LED emergent ray angle, changes to both sides successively from the center of light guide plate incidence surface, and light is refracted in light guide plate through serrated face.Compare and do not do broached-tooth design light guide plate (as shown in Figure 2, LED emergent ray 1 and 2 angle respectively 60 ° and 30 ° time, it is refracted into the angle respectively 55 ° and 71 ° of light guide plate), its refraction angle have increase (LED emergent ray 1 and 2 angle respectively 60 ° and 30 ° time, be refracted into the angle in light guide plate respectively 72 ° and 88 °, light realize parallel enter light).
At the present embodiment, light guide plate is glass material, is made the structure (as shown in Figure 3) of not equal thickness by one-shot forming or secondary operations technique.Site 34 can be passed through the such as techniques such as silk screen printing, laser, etching and make.
At the present embodiment, as shown in Figure 4, this glass light guide plate also includes the formation optical cement layer 5 in its bottom surface 33 and is arranged at the reflective coating 6 bottom optical cement layer 5, and the refractive index of optical cement layer 5 is relatively low, it is preferred to 1.2 ~ 1.5.Reflectance coating directly does outward appearance, so can carry out pad pasting or surface treatment forms various appearance at reflectance coating outer surface, such that it is able to cancel the use of back cover, it is possible to achieve amount ultra-thin, the ultralight design of product, size is more big, and advantage is more obvious.
Embodiment 2
The present embodiment provides a kind of liquid crystal display module, as it is shown in figure 5, the glass light guide plate 3 included in embodiment 1, it also includes light source 4, liquid-crystalline glasses 1 and optical film combination 2.The upper surface 32 that optical film combination 2 is used for light with glass light guide plate 3 is corresponding, and liquid-crystalline glasses 1 is then correspondingly arranged in the top of optical film combination 2；Light source 4 is corresponding with the incidence surface 31 of glass light guide plate, and such module can cancel the use of back cover, it is possible to achieve amount ultra-thin, the ultralight design of product, size is more big, and advantage is more obvious.
Embodiment 3
The present embodiment provides a kind of glass light guide plate 3, as shown in Figure 6, and basically identical with embodiment 1 of its structure, the difference is that: the circular groove of incidence surface 31 generally indent, it is connected with upper surface 32 and bottom surface 33 respectively by upper and lower two miters 35；The plane of symmetry of this incidence surface 31 identical with the plane of symmetry of glass light guide plate (or overlapping).Such circular arc center of circle is closer to LED light source 4 centre of luminescence, and the reflection loss that LED incides on interior concaved circular cambered surface (incidence surface 31) is more few, and namely LED each angular emission light is all vertical with light guide plate inner concave, and reflection loss can reduce to minimum.
Above-described embodiment only for technology design and the feature of the present invention are described, its object is to allow person skilled in the art will appreciate that present disclosure and to implement according to this, can not limit the scope of the invention with this.All equivalences made according to present invention spirit change or modify, and all should be encompassed within protection scope of the present invention.